FR: Streaming audio, not only video

I would like to just view files without storing them in local storage. It's nice that the app can be secured by a password/pin/fingerprint but once a file is downloaded, it can then be easily accessed via a file browser. Is it possible to have a more dropbox-like functionality where, say, an image can be viewed without storing it to the device?

EDIT of @jesmrec: Removing previews will be directly related with Scoped Storage. Audio streaming is an interesting feature. We can track it from here.

Actual behaviour

• Selected file is saved to device in order to be viewed

Expected behaviour

• File is stored in temporary storage and removed once done

Steps to reproduce

1. Open any file not currently saved to device

Can this problem be reproduced with the official owncloud server?
(url: https://demo.owncloud.org, user: test, password: test)
Yes

Environment data

Android version:
10

Device model:
OnePlus 6T

Stock or customized system:
Stock

ownCloud app version:
2.14.2 release fe23fedb4

ownCloud server version:
10.3.2

Logs

Web server error log

Unavailable

ownCloud log (data/owncloud.log)

Unavailable

Start by reviewing the Android file-viewing flow described in the issue and clarify whether the goal is temporary storage, audio streaming, or both. Done should match an agreed behavior for opening remote files without leaving accessible local copies, including the stated audio-streaming requirement.